2020AJ....160..192S

Query : 2020AJ....160..192S

2020AJ....160..192S - Astron. J., 160, 192-192 (2020/October-0)

The Habitable Zone Planet Finder reveals a high mass and low obliquity for the young Neptune K2-25b.

STEFANSSON G., MAHADEVAN S., MANEY M., NINAN J.P., ROBERTSON P., RAJAGOPAL J., HAASE F., ALLEN L., FORD E.B., WINN J., WOLFGANG A., DAWSON R.I., WISNIEWSKI J., BENDER C.F., CANAS C., COCHRAN W., DIDDAMS S.A., FREDRICK C., HALVERSON S., HEARTY F., HEBB L., KANODIA S., LEVI E., METCALF A.J., MONSON A., RAMSEY L., ROY A., SCHWAB C., TERRIEN R. and WRIGHT J.T.

Abstract (from CDS):

Using radial velocity data from the Habitable Zone Planet Finder, we have measured the mass of the Neptune-sized planet K2-25b, as well as the obliquity of its M4.5 dwarf host star in the 600-800 Myr Hyades cluster. This is one of the youngest planetary systems for which both of these quantities have been measured and one of the very few M dwarfs with a measured obliquity. Based on a joint analysis of the radial velocity data, time-series photometry from the K2 mission, and new transit light curves obtained with diffuser-assisted photometry, the planet's radius and mass are 3.44 ± 0.12 R⊕ and 24.5–5.2+5.7M⊕. These properties are compatible with a rocky core enshrouded by a thin hydrogen-helium atmosphere (5% by mass). We measure an orbital eccentricity of e = 0.43 ± 0.05. The sky-projected stellar obliquity is λ = 3° ± 16°, compatible with spin-orbit alignment, in contrast to other "hot Neptunes" that have been studied around older stars.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Exoplanet astronomy - Exoplanet systems - Radial velocity - Exoplanet detection methods - Transit photometry - Photometry - Exoplanet formation - Mini Neptunes - Low mass stars - Near infrared astronomy

VizieR on-line data: <Available at CDS (J/AJ/160/192): fig2.dat tablec1.dat tablec2.dat>

Simbad objects: 13

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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* V1298 Tau TT* 04 05 19.5909996648 +20 09 25.563233736   11.11 10.12 9.57   K1 194 0
2 K2-25 PM* 04 13 05.6131374072 +15 14 52.018080576   15.81 15.56 13.72   M4.5V 108 0
3 K2-25b Pl 04 13 05.6131374072 +15 14 52.018080576           ~ 108 0
4 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
5 NAME LP 424-4b Pl 07 59 05.8395356736 +15 23 29.236065000           ~ 387 1
6 Ross 905b Pl 11 42 11.0933350978 +26 42 23.650782778           ~ 913 1
7 Ross 905 PM* 11 42 11.0933350978 +26 42 23.650782778   12.06 10.613 10.272 8.24 M3V 750 1
8 NAME Barnard's star BY* 17 57 48.4984700685 +04 41 36.113879676 12.497 11.24 9.511 8.298 6.741 M4V 907 2
9 BD+47 2846b Pl 19 28 59.3538826128 +47 58 10.217007804           ~ 415 1
10 HD 197481b Pl 20 45 09.5324974119 -31 20 27.237889841           ~ 158 0
11 HD 197481 BY* 20 45 09.5324974119 -31 20 27.237889841   10.05 8.627 9.078 6.593 M1VeBa1 1344 0
12 TRAPPIST-1 LM* 23 06 29.3684948589 -05 02 29.037301866     18.798 16.466 14.024 M7.5e 1306 0
13 HD 222259Ab Pl 23 39 39.4808078664 -69 11 44.707735104           ~ 73 0

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